TIPS FOR USE:
* Place and lightly hold your index finger against the back camera lens
* Do not press too hard, otherwise blood circulation will not be accurate and results could be affected
* Remain calm and try not to move too much during the measurement, as this can affect the instant results
* Do not measure with cold fingers, when blood circulation is poor, as this leads to inaccurate measurements of your pulse
* If you are using a smartphone without a flashlight, be sure to be in a well-lit area for accurate heartbeat measurement